@jakechampion/cli-testing-library/lib/Output.js

Small but powerful library for testing CLI the way it is used by people.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Output = void 0;
class Output {
    _stdoutHandlers = [];
    _stderrHandlers = [];
    _stdout = [];
    _stderr = [];
    replaceStrings = {};
    get stdout() {
        return this.processStdLineGet(this._stdout);
    }
    set stdout(value) {
        this.processStdLineSet(value, '_stdout');
        this._stdoutHandlers.forEach((fn) => {
            fn(value[0], 'stdout');
        });
    }
    get stderr() {
        return this.processStdLineGet(this._stderr);
    }
    set stderr(value) {
        this.processStdLineSet(value, '_stderr');
        this._stderrHandlers.forEach((fn) => {
            fn(value[0], 'stderr');
        });
    }
    processStdLineSet = (value, type) => {
        value.forEach((input) => {
            input
                .toString()
                .split('\n')
                .forEach((line) => {
                this[type].push(line);
            });
        });
    };
    processStdLineGet = (buffer) => {
        const output = buffer
            .map((line) => {
            let output = line.toString();
            for (const [original, replaced] of Object.entries(this.replaceStrings)) {
                const reg = new RegExp(original, 'gm');
                output = output.replace(reg, replaced);
                output = output.trim();
            }
            return output;
        })
            .filter((line) => line !== '');
        return output;
    };
    on = (handler, type) => {
        if (type === 'stdout') {
            this._stdoutHandlers.push(handler);
            return;
        }
        if (type === 'stderr') {
            this._stderrHandlers.push(handler);
            return;
        }
        this._stdoutHandlers.push(handler);
        this._stderrHandlers.push(handler);
    };
    off = (handler, type) => {
        if (type === 'stdout') {
            this._stdoutHandlers = this._stdoutHandlers.filter((item) => item !== handler);
            return;
        }
        if (type === 'stderr') {
            this._stderrHandlers = this._stderrHandlers.filter((item) => item !== handler);
            return;
        }
        this._stdoutHandlers = this._stdoutHandlers.filter((item) => item !== handler);
        this._stderrHandlers = this._stderrHandlers.filter((item) => item !== handler);
    };
}
exports.Output = Output;